Troubleshoot

Traceback (most recent call last):
  File "/tmp/buildpack_b51fad4c-fdbd-4f19-be81-40c96256b12e/vendor/bpwatch/bpwatch", line 8, in ?
    DEFAULT_PATH = '{0}.zip'.format(os.path.abspath(__file__))
AttributeError: 'str' object has no attribute 'format'